I'd like to be able to acquire the bonuses on the after-market to sate the completionist in me but Square-Enix has decided to add in-game pre-order bonuses and other retailer incentives for Final Fantasy XIII-2, and I'm having trouble keeping track of them all.

What retailer bonuses are available that can only be acquired by bonus/redemption codes (like pre-orders)?

I'm voting to close your question as "Too localized" Mark. After the game has been released this question will no longer be relevant, thus it is too localized in time. Furthermore, depending on the region / where you pre-order it from there will also be differences, which is also too localized.
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WipqoznJan 31 '12 at 21:33

@Wipqozn The purpose of Stack Exchange is to adapt to rapidly changing events and specific situations: just because a question is localized doesn't make it too localized for Stack Exchange. I've revised the question to be about in-game retailer bonsues in general, however, to address the fact that you can no longer get pre-order bonsues now that the game is released.
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user3389Jan 31 '12 at 21:44

The Final Fantasy Wikia had a list of all DLC, including in-game retailer bonuses, but it turns out most of the retailer bonuses were timed exclusives and are available for purchase, at least in North America: